For an ideal current source, what is the voltage gain of the following circuit?(a) gm1 * rd1 * gm2 * 2Rd2(b) – gm1 * rd1 * gm2 * Rd2(c) 2gm1 * rd1 * gm2 * Rd2(d) – gm1 * rd1 * gm2 * Rd2I got this question during an interview.Origin of the question is MOSFET Amplifier with CG Configuration in portion FET Amplifiers of Analog Circuits

For an ideal current source, what is the voltage gain of the following

1.	For an ideal current source, what is the voltage gain of the following circuit?(a) gm1 * rd1 * gm2 * 2Rd2(b) – gm1 * rd1 * gm2 * Rd2(c) 2gm1 * rd1 * gm2 * Rd2(d) – gm1 * rd1 * gm2 * Rd2I got this question during an interview.Origin of the question is MOSFET Amplifier with CG Configuration in portion FET Amplifiers of Analog Circuits
Answer» Right choice is (d) – gm1 * rd1 * gm2 * RD2 The best explanation: The voltage gain for the C.G. stage is SIMPLY gm * Rd1. The voltage gain of the next stage is – gm * Rd2. Note that, the ideal current source exhibits INFINITE OUTPUT impedance and doesn’t AFFECT but only increases the linearity of operation.

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